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NEW RADIOISOTOPE TRACER TECHNIQUE FOR MEASURING WATER PERMEABILITY OF COATING FILMS

A NEW RADIOCHEMICAL METHOD OF MEASURING THE PERMEABILITY CONSTANT AND THE DIFFUSION RATE OF WATER VAPOR THROUGH A POLYMER FILM IS PRESENTED. THE NEW METHOD IS FOUND TO BE MORE PRECISE, RAPID AND SENSITIVE THAN THE ASTM STANDARD METHOD. THE NEW METHOD IS ALSO FOUND TO BE USEFUL IN THE INVESTIGATION OF IMPORTANT PARAMETERS INFLUENCING PERMEABILITY OF WATER VAPOR. SUCH VERSATILITY IS NOT POSSESSED BY OTHER REPRTED RADIOCHEMICAL METHODS OR BY THE ASTM STANDARD METHOD. /AUTHOR/